Thermodynamics: An Engineering Approach 8th Edition

Published by McGraw-Hill Education
ISBN 10: 0-07339-817-9
ISBN 13: 978-0-07339-817-4

Chapter 1 - Introduction and Basic Concepts - Problems: 1-33C

Answer

Heat would flow from B to A.

Work Step by Step

Heat flows from the higher temperature systems/bodies into the systems/bodies with lower temperature (if they are in thermal contact), until they reach thermal equilibrium (same temperature). In this case, heat would flow from the sytem $B (50^{\circ}C)$ into A $(20 ^{\circ}C)$. The fact that system A has a higher thermal energy content is irrelevant to this process.
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